Human Skull - supraorbital foramen (of frontal bone)

The probe is pointing to a supraorbital foramen on the frontal bone, a tiny hole above the eye socket. In total, the frontal bone has 2 supraorbital foramina: one above each eye socket. 

Bone terms:
foramen (singular) - a hole in a bone (does not refer to a certain size). Usually a short, round, and smooth hole that blood vessels and nerves pass through. Exception (one example): foramen lacerum (jagged hole).
foramina (plural) - 2 or more "foramen".